2
edits
432: Difference between revisions
Jump to navigation
Jump to search
→Pictures
No edit summary |
|||
| Line 41: | Line 41: | ||
When the metal covers are removed, one can see the shaping/compensation capacitors. These can be unplugged, each one has 6 legs. | When the metal covers are removed, one can see the shaping/compensation capacitors. These can be unplugged, each one has 6 legs. | ||
File:Tek_432_internal_4.jpg | File:Tek_432_internal_4.jpg | ||
Another view of the shaping capacitors. Work on one channel at a time to avoid mixing these up. | Another view of the shaping capacitors. Work on one channel at a time to avoid mixing these up. Carefully clean the legs with isopropal alcohol and paper towels. | ||
File:Tek_432_internal_5.jpg | File:Tek_432_internal_5.jpg | ||
In order to access the rotary gain switch fingers, one must first remove these BNC connectors, which means unsoldering the central wire (connects to a resistor/inductor feed-through) plus a debouce capacitor and lead going to the x1 x10 indicator lights. | In order to access the rotary gain switch fingers, one must first remove these BNC connectors, which means unsoldering the central wire (connects to a resistor/inductor feed-through) plus a debouce capacitor and lead going to the x1 x10 indicator lights. | ||
| Line 53: | Line 53: | ||
View of the input preamp. This board needs to be unplugged only, but not removed or unsoldered. It has four 2-pin connectors. Then it can be removed, still attached to the compensation capacitor carriers. | View of the input preamp. This board needs to be unplugged only, but not removed or unsoldered. It has four 2-pin connectors. Then it can be removed, still attached to the compensation capacitor carriers. | ||
File:Tek_432_internal_10.jpg | File:Tek_432_internal_10.jpg | ||
Lifting off the assembly consisting of the 2 compensation capacitor carrier plus the vertical preamp board plus the push-button switch board for CH1/CHOP/ALTERNATE/CH2. The switch board has two plug connectors below that must be removed. It helps to have long fingers or a good pair of needle nose pliers. | Lifting off the assembly consisting of the 2 compensation capacitor carrier plus the vertical preamp board plus the push-button switch board for CH1/CHOP/ALTERNATE/CH2. The switch board has two plug connectors below that must be removed. It helps to have long fingers or a good pair of needle nose pliers. | ||
File:Tek_432_internal_11.jpg | File:Tek_432_internal_11.jpg | ||
Second view under the assembly being removed. | Second view under the assembly being removed. | ||
File:Tek_432_internal_12.jpg | File:Tek_432_internal_12.jpg | ||
The rotary switches exposed. Each one has four contact fingers underneath. They are cleaned using small (5mm) wide strips of paper soaked in isopropanol alcohol (2-propanol). | |||
File:Tek_432_internal_13.jpg | File:Tek_432_internal_13.jpg | ||
One can just see the four contact fingers peeking out. You can get paper under them using small tweezers. Patience and calm are required. | |||
File:Tek_432_internal_14.jpg | File:Tek_432_internal_14.jpg | ||
A view of the variable-gain potentiometers. Note that the bodies are both cracked in the same place. Both had been noisy, but the noise was largely eliminated by sweeping them back and forth a dozen times. I guess that scrubbed off the oxide. | |||
File:Tek_432_internal_15.jpg | File:Tek_432_internal_15.jpg | ||
A view of the contact fingers underneath the capacitor shaping blocks. Each channel has 8 NC and 8 NO fingers (the other half are on the bottom). These are easy to reach and clean as described. So each channel has a total of 20 contact fingers to clean. | |||
</gallery> | </gallery> | ||
[[Category:400 series scopes]] | [[Category:400 series scopes]] | ||
[[Category:Specifications needed]] | [[Category:Specifications needed]] | ||